EP4123848A1 - Dispositif et système de pompage laser comprenant un concentrateur de lumière géométrique et un isolateur thermique - Google Patents

Dispositif et système de pompage laser comprenant un concentrateur de lumière géométrique et un isolateur thermique Download PDF

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EP4123848A1
EP4123848A1 EP22184278.4A EP22184278A EP4123848A1 EP 4123848 A1 EP4123848 A1 EP 4123848A1 EP 22184278 A EP22184278 A EP 22184278A EP 4123848 A1 EP4123848 A1 EP 4123848A1
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Prior art keywords
pump
laser
light
gain material
laser gain
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German (de)
English (en)
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Yen-Chieh Huang
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National Tsing Hua University NTHU
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National Tsing Hua University NTHU
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/094049—Guiding of the pump light
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/0602—Crystal lasers or glass lasers
    • H01S3/061—Crystal lasers or glass lasers with elliptical or circular cross-section and elongated shape, e.g. rod
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
    • H01S5/4025—Array arrangements, e.g. constituted by discrete laser diodes or laser bar
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
    • F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/094049—Guiding of the pump light
    • H01S3/094057—Guiding of the pump light by tapered duct or homogenized light pipe, e.g. for concentrating pump light
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/02—Structural details or components not essential to laser action
    • H01S5/024—Arrangements for thermal management
    • H01S5/02407—Active cooling, e.g. the laser temperature is controlled by a thermo-electric cooler or water cooling
    • H01S5/02423—Liquid cooling, e.g. a liquid cools a mount of the laser
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
    • H01S5/041—Optical pumping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/02—Constructional details
    • H01S3/04—Arrangements for thermal management
    • H01S3/0407—Liquid cooling, e.g. by water
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/094084—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light with pump light recycling, i.e. with reinjection of the unused pump light, e.g. by reflectors or circulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
    • H01S5/14—External cavity lasers
    • H01S5/141—External cavity lasers using a wavelength selective device, e.g. a grating or etalon

Definitions

  • the present disclosure relates to a laser pumping device and system thereof including a dielectric block, being a geometric light concentrator and heat insulator, and, in particular, relates to one or an array of low-thermal-conductivity optical dielectrics, which guide and concentrate low-intensity light from light-emitting diodes or laser diodes to generate high-brightness light to pump a laser gain material with higher efficiency and less heat in the laser crystal.
  • a laser is a high-energy density radiation device containing a laser gain material pumped by an energy source.
  • pump sources to a laser.
  • an electric source can deliver electric energy to pump a semiconductor laser (also dubbed as a laser diode); a laser diode can then pumps a solid-state laser; a flash lamp is often used to pump a high-power pulse laser, etc.
  • the pump energy has to be efficiently absorbed by the laser gain material. Therefore, there are two key factors to achieve high pump efficiency. The first is to have a high pump intensity matched to the emission volume of the laser. The second is to have a pump spectrum matched to the absorption spectrum of the laser gain material.
  • a laser diode can emit a narrow-line high-intensity focused radiation matched to the absorption peak of a laser gain material
  • a diode-laser pumped abbreviated as "diode-pumped” for what follows
  • solid-state laser is known to be very efficient.
  • a flash-lamp source is relative low-cost, the broadband and diverging light from it cannot pump a solid-state laser as efficiently as a diode-pumped laser. It is known in the art (Kozo Kamiryo et al. 1966 Jpn. J. Appl. Phys.
  • a geometric improvement for the pump efficiency is to install a flash-lamp tube along one of the foci of an elliptical pump chamber and install a laser rod along the other, so that the pump light of the flash lamp can mostly reach the laser gain material.
  • a light-emitting diode is emerging as a pump source for a solid-state laser (see, for instance, Brenden Villars et al., 2015 Optics Letts. 40 3049).
  • a light-emitting diode emits a diverging light with a much smaller spectral width than a flash lamp and a slightly broader one than a laser diode. Therefore, the spectral energy of a light-emitting diode is better matched to the spectral absorption of a laser gain material than that of a flash lamp.
  • a light-emitting diode also has a much longer lifetime and better stability than a flash lamp.
  • a light-emitting diode is lower cost in installation and maintenance, less susceptible to electrostatic damage, and less sensitive to temperature variation.
  • a light-emitting diode does not generate a focused light.
  • a light-emitting diode or an array of light-emitting diodes emits a forward radiation with a cone angle of about 120 degrees. Since light-emitting diodes cannot be made into a strong tube emitter like a flash lamp, an elliptical pump chamber commonly adopted by a flash lamp in the prior art is not suitable for a light-emitting-diode pumped solid-state laser.
  • a light-emitting diode As close as possible to a laser gain material (for instance, Chun Yu Cho et al ., 2017 Optics Letts. 42 2394).
  • a laser relies on population inversion to achieve a lasing threshold. If the ground state of a laser gain material is thermally populated with many atoms, it becomes difficult for the upper-state atoms to reach population inversion.
  • a light-emitting diode generates heat, which prevents the light-emitting diode from being installed in the proximity of a laser gain material for efficient pumping.
  • the present disclosure to provide a new laser pumping device and its embodiments that can effectively concentrate the light from, for instance, light emitting diodes, for pumping a laser and yet mitigate the heat of the pump-light source from reaching the laser gain material. It is also an additional purpose of the present disclosure to increase the brilliance of the pump light of a laser, so as to increase the pump efficiency of a laser.
  • a laser pumping device includes a pump-light source, a dielectric block, and a laser gain material.
  • the pump-light source is configured to emit a pump light.
  • the dielectric block with a pump axis includes a first surface, a second surface, and a plural number of reflection surfaces.
  • the dielectric block is configured to receive the pump light into the first surface, guide the pump light along the pump axis surrounded by the reflection surfaces, and transmit the pump light toward the second surface.
  • the laser gain material is installed at a position next to the second surface close to the pump axis and configured to receive and absorb the pump light emitted from the second surface.
  • the pump-light source may include an array of light-emitting diodes, or an array of laser diodes, or an array of mixed light-emitting-diodes and laser diodes.
  • oppositely faced two of the reflection surfaces may be parallel to each other surrounding the pump axis, or the oppositely faced two reflection surfaces may be wedged with a down-tapered aperture perpendicular to the pump axis.
  • a material of the dielectric block may be transparent to the pump light and is one among glass, quartz, and fused silica.
  • At least one of the first and second surfaces of the dielectric block may be optically coated with anti-reflecting dielectric layers to increase a transmission of the pump light through the dielectric block.
  • the first surface of the dielectric block may be optically coated with dielectric layers having materials different from a material of the dielectric block to stimulate an emission of the pump light at an absorption wavelength of the laser gain material.
  • the laser gain material may be one among Nd:YAG, Nd:YVO 4 , Nd:GdVO 4 , Nd:KGW, Nd:YLF, Nd:glass, Cr:YAG, Cr:LiSAF, Yb:YAG, Yb:glass, Er:YAG, Er:glass, Tm:glass, and Ti:sapphire crystals.
  • the laser gain material may be installed before a reflecting mirror along the pump axis, which recycles an unabsorbed portion of the pump light back to the laser gain material.
  • the laser gain material may be installed in a laser cavity.
  • the laser gain material may be installed in a laser amplifier.
  • a laser pumping system includes a plural number of the aforementioned pump-light sources, a plural number of the aforementioned dielectric blocks, the aforementioned laser gain material and a cooling apparatus.
  • the pump-light sources are configured to respectively emit a plural number of the aforementioned pump lights.
  • the dielectric blocks are configured to respectively transmit the pump lights and insulate heat of the pump-light sources.
  • the laser gain material is configured to receive and absorb the pump lights.
  • the cooling apparatus is configured to remove heats generated in the pump-light sources and the laser gain material.
  • the dielectric blocks may be aligned with the respective pump axes intercepting at one point to concentrate the pump lights.
  • the laser gain material may be installed in a position of the pump lights being concentrated to receive maximum pumping.
  • the cooling apparatus may include at least one of an air cooling element, a Peltier thermoelectric cooler, and a water cooling element attached to a backside of at least one of the pump-light sources.
  • the cooling apparatus may include a water cooling pipe enclosing the laser gain material.
  • Fig. 1 illustrates a dielectric block (i.e., an optical dielectric slab) 1000 having parallel walls (i.e., the top side wall 1050 and the wall parallel thereto) along a pump axis 1010. Each of the parallel walls is a reflection surface.
  • An input ray 1005 of a pump light is incident on the first surface (i.e., the front surface, the input surface) 1020 at an incidence angle ⁇ and the refracted ray 1040 of the input ray 1005 of the pump light is incident on the top side wall 1050 at an angle of ⁇ .
  • ⁇ c sin -1 (n a /n) with n being the refractive index of the dielectric block 1000 and n a being the refractive index of the environment.
  • n a is taken to be 1 for an air environment.
  • the first insight of the present disclosure is to couple a highly diverging pump light into one or a plural of dielectric blocks with parallel walls having a large enough refractive index and thereby a large numerical aperture NA p , which allows guiding and concentrating the light from the first surface 1020 to the second surface (i.e., the end surface, the output surface) 1030 for pumping a laser gain material 1070.
  • the dielectric block 1000 with the parallel walls has a low thermal conductivity for insulating the heat of the pump-light source from the laser gain material 1070.
  • both the first surface 1020 and the second surface 1030 are coated with anti-reflection dielectric layers to increase the transmission of the pump light through the dielectric block 1000 and toward the laser gain material 1070.
  • the pump light source can include or be light-emitting diodes, laser diodes, or a combination of the two. As previously explained, matching the pump wavelength to the absorption wavelength of the laser gain material 1070 can greatly enhance the pump efficiency for a laser. Although a light-emitting diode has a relatively narrower emission spectrum than that of a flash lamp, a laser diode has superior spectral brightness for laser pumping.
  • the first surface 1020 is optically coated with dielectric layers having materials different from a material of the dielectric block 1000 to stimulate a light-emitting diode to emit a wavelength matched to the absorption wavelength of the laser gain material 1070.
  • a wedged dielectric block 1100 couples the input ray 1105 of the pump light from the first surface 1120 to the second surface 1130.
  • the first surface 1120 has a width D and the second surface 1130 has a width of d, where D ⁇ d due to the wedge angle ⁇ ⁇ 0.
  • this dielectric block 1100 is highly transparent to the pump light and can concentrate the pump light incident on the first surface 1120 toward the second surface 1130.
  • this dielectric block 1100 has a low thermal conductivity to insulate the heat of the pump-light source from the laser gain material 1170.
  • the intensity of the pump light will increase by a geometric factor of D/d.
  • the angular acceptance of an optical system is determined by the numerical aperture NA of the system.
  • Equation (4) ⁇ is the incidence angle of the input ray 1105 on the first surface 1120.
  • NA w is always smaller than NA p for a finite N ⁇ . It is therefore the intention of the present disclosure to take advantage of the wedged dielectric for concentrating the pump light and insulating the pump-light-source heat based on a prudent design of the NA w subject to Equation (5).
  • At least one of the first surface 1120 and the second surface 1130 is coated with anti-reflection dielectric layers to increase the transmission of the pump light through the dielectric block 1100 and toward the laser gain material 1170.
  • the pump-light source can include or be light-emitting diodes, laser diodes, or a combination of the two.
  • the first surface 1120 is optically coated with dielectric layers having materials different from a material of the dielectric block 1100 to stimulate the light-emitting diode to emit a wavelength matched to the absorption wavelength of the laser gain material 1170.
  • the optical dielectric blocks 1000 and 1100 in Figs. 1 and 2 can be the building blocks to concentrate the pump light on and insulate the pump-light-source heat from the laser gain material 1070 and 1170.
  • the geometric scaling factor D/d of the pump intensity for a singly wedged dielectric block can be increased to the square of it by adopting the doubly wedged dielectric block shown in Figs. 5 and 6 .
  • Fig. 1 the geometric scaling factor D/d of the pump intensity for a singly wedged dielectric block, as shown in Figs. 3 and 4 , can be increased to the square of it by adopting the doubly wedged dielectric block shown in Figs. 5 and 6 .
  • an embodiment of the present disclosure is to install a reflecting mirror 6070 behind the laser gain material (a laser rod, for instance) 6040, so that the unabsorbed pump light is re-directed back to pump the laser gain material 6040.
  • the geometric scaling factor of the pump intensity can be further multiplied by installing a plural number of the wedged dielectric blocks (e.g., dielectric blocks 7100, 7200 in Fig. 8 ) around a laser gain material (e.g., a laser gain material 7040 in Fig. 8 ). Therefore, the present disclosure provides an innovative optical device and its embodiments to scale up the intensity of pump lights for pumping a solid-state laser with effective thermal insulation between the pump and the laser gain material.
  • the pump-light source may include an array of light-emitting-diode dies, laser-diode dies, or a combination of the two.
  • a material of the dielectric block may be transparent to the pump light and one among glass, quartz, and fused silica. Therefore, the dielectric block has high optical transparency to transmit the pump light to reach the laser gain material and the dielectric block has low thermal conductivity to insulate the heat of the pump-light source from reaching the laser gain material.
  • At least one of the first and second surfaces of the dielectric block may be optically coated with anti-reflecting dielectric layers to increase a transmission of the pump light through the dielectric block.
  • the first surface of the dielectric block may be optically coated with dielectric layers having materials different from a material of the dielectric block to stimulate an emission of the light-emitting diode at an absorption wavelength of the laser gain material, so as to increase the efficiency for a light-emitting-diode pumped laser.
  • the laser gain material of any of the 1st to 7th embodiments may be one among Nd:YAG, Nd:YVO 4 , Nd:GdVO 4 , Nd:KGW, Nd:YLF, Nd:glass, Cr:YAG, Cr:LiSAF, Yb:YAG, Yb:glass, Er:YAG, Er:glass, Tm:glass, and Ti:sapphire crystals. Therefore, the laser gain material is advantageous in emitting a laser or amplifying a laser radiation, when pumped by the concentrated pump lights.
  • the laser pumping device includes the pump-light source (i.e., the pump-light illuminator) 2010, the dielectric block 2000, and the laser gain material (the laser gain material unit; for instance, a laser rod) 2040.
  • the pump-light source 2010 is configured to emit a pump light.
  • the pump-light source can be light-emitting diodes, laser diodes, or a combination of the two.
  • the dielectric block 2000 with the pump axis includes the first surface 2700, the second surface 2800, and a plural number of reflection surfaces, which are disposed about the pump axis and between the first surface 2700 and the second surface 2800.
  • the dielectric block 2000 is configured to receive the pump light into the first surface 2700, guide the pump light along the pump axis surrounded by the reflection surfaces, and transmit the pump light toward the second surface 2800.
  • the laser gain material 2040 is installed at a position next to the second surface 2800 close to the pump axis and configured to receive and absorb the pump light emitted from the second surface 2800. Therefore, the dielectric block 2000 is advantageous of serving as a high-efficiency geometric light concentrator and heat insulator for laser pumping.
  • the dielectric block 2000 has an input aperture (i.e., the first surface 2700) larger than an output aperture (i.e., the second surface 2800), and the pump light is incident on the larger input aperture and concentrated toward the laser gain material 2040 at the smaller output aperture.
  • the laser gain material 2040 is installed in a laser amplifier to amplify a weak input laser 2020 at the input and generate a strong output laser 2030 at the output.
  • the laser pumping device includes the pump-light source 3010, the dielectric block 3000, and the laser gain material 3040.
  • the pump-light source 3010 is configured to emit a pump light.
  • the pump-light source can be light-emitting diodes, laser diodes, or a combination of the two.
  • the dielectric block 3000 with the pump axis includes the first surface 3700, the second surface 3800, and a plural number of reflection surfaces, which are disposed about the pump axis and between the first surface 3700 and the second surface 3800.
  • the dielectric block 3000 is configured to receive the pump light into the first surface 3700, guide the pump light along the pump axis surrounded by the reflection surfaces, and transmit the pump light toward the second surface 3800.
  • the laser gain material 3040 is installed at a position next to the second surface 3800 close to the pump axis and configured to receive and absorb the pump light emitted from the second surface 3800.
  • the laser gain material 3040 is installed in a laser cavity. Specifically, there are a laser cavity mirror 3020 disposed in an input end of the laser gain material 3040, and an output coupler 3030 disposed in an output end of the laser gain material 3040, so as to build up an output laser 3050 emitted from the laser gain material 3040.
  • the laser pumping device includes the pump-light source 4010, the dielectric block 4000 and the laser gain material 4040.
  • the pump-light source 4010 is configured to emit a pump light.
  • the pump-light source can be light-emitting diodes, laser diodes, or a combination of the two.
  • the dielectric block 4000 with the pump axis includes the first surface 4700, the second surface 4800, and a plural number of reflection surfaces, which are disposed about the pump axis and between the first surface 4700 and the second surface 4800.
  • the dielectric block 4000 is configured to receive the pump light into the first surface 4700, guide the pump light along the pump axis surrounded by the reflection surfaces, and transmit the pump light toward the second surface 4800.
  • the laser gain material 4040 is installed at a position next to the second surface 4800 close to the pump axis and configured to receive and absorb the pump light emitted from the second surface 4800.
  • oppositely faced two of the reflection surfaces of the dielectric block 4000 are wedged with a down-tapered aperture perpendicular to the pump axis, each having a side wedge angle of ⁇ .
  • the other oppositely faced two of the reflection surfaces of the dielectric block 4000 are wedged with a down-tapered aperture perpendicular to the pump axis, each having a top wedge angle of ⁇ .
  • the laser gain material 4040 is installed in a laser amplifier to amplify a weak input laser 4020 at the input and generate a strong output laser 4030 at the output.
  • the laser pumping device includes the pump-light source 5010, the dielectric block 5000, and the laser gain material 5040.
  • the pump-light source 5010 is configured to emit a pump light.
  • the pump-light source can be light-emitting diodes, laser diodes, or a combination of the two.
  • the dielectric block 5000 with the pump axis includes the first surface 5700, the second surface 5800, and a plural number of reflection surfaces, which are disposed about the pump axis and between the first surface 5700 and the second surface 5800.
  • the dielectric block 5000 is configured to receive the pump light into the first surface 5700, guide the pump light along the pump axis surrounded by the reflection surfaces, and transmit the pump light toward the second surface 5800.
  • the laser gain material 5040 is installed at a position next to the second surface 5800 close to the pump axis and configured to receive and absorb the pump light emitted from the second surface 5800.
  • oppositely faced two of the reflection surfaces of the dielectric block 5000 are wedged with a down-tapered aperture perpendicular to the pump axis, each having a side wedge angle of ⁇ .
  • the other oppositely faced two of the reflection surfaces of the dielectric block 5000 are wedged with a down-tapered aperture perpendicular to the pump axis, each having a top wedge angle of ⁇ .
  • the laser gain material 5040 is installed in a laser cavity. Specifically, there are a laser cavity mirror 5020 disposed in an input end of the laser gain material 5040, and an output coupler 5030 disposed in an output end of the laser gain material 5040, so as to build up an output laser 5050 emitted from the laser gain material 5040.
  • the laser pumping device includes the pump-light source 6010, the dielectric block 6000 and the laser gain material 6040.
  • the pump-light source 6010 is configured to emit a pump light 6030.
  • the pump-light source can be light-emitting diodes, laser diodes, or a combination of the two.
  • the dielectric block 6000 with the pump axis includes the first surface 6700, the second surface 6800, and a plural number of reflection surfaces, which are disposed about the pump axis and between the first surface 6700 and the second surface 6800.
  • the dielectric block 6000 is configured to receive the pump light 6030 into the first surface 6700, guide the pump light 6030 along the pump axis surrounded by the reflection surfaces, and transmit the pump light 6030 toward the second surface 6800.
  • the laser gain material 6040 is installed at a position next to the second surface 6800 close to the pump axis and configured to receive and absorb the pump light 6030 emitted from the second surface 6800.
  • oppositely faced two of the reflection surfaces of the dielectric block 6000 are wedged with a down-tapered aperture perpendicular to the pump axis, each having a wedge angle of ⁇ , as shown in Fig. 7 .
  • the laser gain material 6040 is installed before a reflecting mirror 6070 along the pump axis for transmitting the pump light 6030.
  • the reflecting mirror 6070 reflects an unabsorbed portion of the pump light 6030 back to the laser gain material 6040, so as to increase the pump absorption in the laser gain material 6040.
  • the reflecting mirror 6070 has a curved radius of curvature to focus the reflected lights into the laser gain material 6040.
  • a laser pumping system includes the pump-light sources 7010, 7012, the dielectric blocks 7100, 7200, and the laser gain material 7040.
  • the pump-light source 7010 with the dielectric block 7100 and the pump-light source 7012 with the dielectric block 7200 are disposed on two sides of the laser gain material 7040.
  • the pump-light source 7010 is configured to emit a pump light 7130.
  • the pump-light source can be light-emitting diodes, laser diodes, or a combination of the two.
  • the dielectric block 7100 with the pump axis includes the first surface 7700, the second surface 7800, and a plural number of reflection surfaces, which are disposed about the pump axis and between the first surface 7700 and the second surface 7800.
  • the dielectric block 7100 is configured to receive the pump light 7130 into the first surface 7700, guide the pump light 7130 along the pump axis surrounded by the reflection surfaces, and transmit the pump light 7130 toward the second surface 7800.
  • the laser gain material 7040 is installed at a position next to the second surface 7800 close to the pump axis and configured to receive and absorb the pump light 7130 emitted from the second surface 7800.
  • the pump-light source 7012 is configured to emit the pump light 7230.
  • the dielectric block 7200 with the pump axis includes the first surface 7720, the second surface 7820, and a plural number of reflection surfaces, which are disposed about the pump axis and between the first surface 7720 and the second surface 7820.
  • the dielectric block 7200 is configured to receive the pump light 7230 into the first surface 7720, guide the pump light 7230 along the pump axis surrounded by the reflection surfaces, and transmit the pump light 7230 toward the second surface 7820.
  • the laser gain material 7040 is installed at a position next to the second surface 7820 close to the pump axis and configured to receive and absorb the pump light 7230 emitted from the second surface 7820.
  • each of the dielectric blocks 7100 and 7200 are wedged with a down-tapered aperture perpendicular to the pump axis, each having a wedge angle of ⁇ , shown in Fig. 8 .
  • the dielectric blocks 7100 and 7200 are aligned with the respective pump axes intercepting at one point to concentrate the pump lights 7130 and 7230.
  • the laser gain material 7040 is installed in a position of the pump lights 7130 and 7230 being concentrated to receive maximum pumping by the pump lights 7130 and 7230.
  • a laser pumping system includes the cooling apparatuses 8010, 8020, the laser gain material 8040, the dielectric blocks 8100, 8200, 8300, 8400, 8500, 8600 and the respective pump-light sources.
  • the pump-light sources corresponding to the dielectric blocks 8100, 8200, 8300, 8400, 8500, 8600 are configured to emit pump lights 8130, 8230, 8330, 8430, 8530, 8630, respectively.
  • Each of the pump-light sources can be light-emitting diodes, laser diodes, or a combination of the two.
  • the cooling apparatus 8010 can be a water cooling apparatus, which is attached to backsides of all the pump-light sources to remove the heat generated in the pump-light sources.
  • the cooling apparatus 8020 is specifically a water cooling apparatus, which encloses the laser gain material 8040 to remove the heat generated in the laser gain material 8040.
  • each of the cooling apparatuses 8010, 8020 can be one assisted by an air circulation or a Peltier thermoelectric cooler. Therefore, it helps to remove heats generated by the pump-light sources and the laser gain material.
  • each of the dielectric blocks 8100, 8200, 8300, 8400, 8500, 8600 are wedged with a down-tapered aperture perpendicular to the pump axis, as shown in Fig. 9 .
  • the dielectric blocks 8100, 8200, 8300, 8400, 8500, 8600 are aligned with the respective pump axes intercepting at one point to concentrate the pump lights 8130, 8230, 8330, 8430, 8530, 8630.
  • the laser gain material 8040 is installed in a position of the pump lights 8130, 8230, 8330, 8430, 8530, 8630 being concentrated to receive maximum pumping by the pump lights 8130, 8230, 8330, 8430, 8530, 8630.
  • the contents of the laser pumping system of the 6th embodiment with Fig. 8 can be referred for the laser pumping system of the 7th embodiment with Fig. 9 , and the other details of the laser pumping system of the 7th embodiment are omitted herein.

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EP22184278.4A 2021-07-13 2022-07-12 Dispositif et système de pompage laser comprenant un concentrateur de lumière géométrique et un isolateur thermique Pending EP4123848A1 (fr)

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US20240302650A1 (en) * 2023-03-07 2024-09-12 L3Harris Technologies, Inc. Method for Symmetrizing Single-Sided Pump Laser Profiles

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009109978A1 (fr) * 2008-03-06 2009-09-11 Soreq Nuclear Research Center Compensation d'aberration pour barreaux laser à puissance moyenne élevée par pompage transversal par des diodes à guides
US20170149197A1 (en) 2014-04-17 2017-05-25 Colorado School Of Mines Led pumped laser device and method of use
US20200412082A1 (en) * 2018-02-26 2020-12-31 Cynosure, Llc Q-switched Cavity Dumped Sub-nanosecond Laser

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5307430A (en) 1992-11-30 1994-04-26 The United States Of America As Represented By The United States Department Of Energy Lensing duct
JPH0794813A (ja) * 1993-09-20 1995-04-07 Mitsubishi Heavy Ind Ltd 半導体レーザ励起固体レーザ装置
US5854802A (en) * 1996-06-05 1998-12-29 Jin; Tianfeng Single longitudinal mode frequency converted laser
US5978407A (en) * 1997-03-31 1999-11-02 United States Enrichment Corporation Compact and highly efficient laser pump cavity
JP4377232B2 (ja) * 2001-11-21 2009-12-02 ジェネラル アトミックス 分布利得媒体を含むレーザ
US7046710B2 (en) 2003-08-28 2006-05-16 Raytheon Company Gain boost with synchronized multiple wavelength pumping in a solid-state laser
US7388895B2 (en) 2003-11-21 2008-06-17 Tsinghua University Corner-pumping method and gain module for high power slab laser
CN1822452A (zh) 2006-03-22 2006-08-23 中国科学院上海光学精密机械研究所 采用透镜导管耦合的固体板条激光器
CN101282021A (zh) 2007-04-03 2008-10-08 清华大学 一种可提高效率和均匀性的泵浦方法及板条型固体激光器
US7649920B2 (en) 2007-04-03 2010-01-19 Topcon Corporation Q-switched microlaser apparatus and method for use
JP5330801B2 (ja) 2008-11-04 2013-10-30 三菱重工業株式会社 レーザ利得媒質、レーザ発振器及びレーザ増幅器
US7983313B2 (en) * 2009-01-30 2011-07-19 Northrop Grumman Information Technology, Inc. System and method for coupling multiple beams to an active fiber
CN102484346B (zh) 2009-06-15 2015-04-08 Pan技术生物解决方案股份公司 单片侧面泵浦的固态激光器及其应用
WO2010145855A1 (fr) 2009-06-15 2010-12-23 Pantec Biosolutions Ag Laser à solide monolithique à pompage latéral et procédé de fonctionnement associé
US8576885B2 (en) * 2012-02-09 2013-11-05 Princeton Optronics, Inc. Optical pump for high power laser
DE112013007731T5 (de) * 2013-12-27 2016-12-08 Academy Of Opto-Electronics, Chinese Academy Of Sciences Große-Apertur-Laser-Verstärker, der durch einen mehrdimensionalen Laserdioden-stapel seitengepumpt ist
CN203645130U (zh) 2013-12-27 2014-06-11 福州高意通讯有限公司 一种高功率玻璃掺杂激光器
CN103762490B (zh) 2014-01-16 2017-01-18 西安电子科技大学 一种利用热透镜提高光束质量的激光谐振腔
CN106253035A (zh) 2016-08-26 2016-12-21 中国科学院光电研究院 多边形的激光增益结构、激光振荡器以及激光放大器

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009109978A1 (fr) * 2008-03-06 2009-09-11 Soreq Nuclear Research Center Compensation d'aberration pour barreaux laser à puissance moyenne élevée par pompage transversal par des diodes à guides
US20170149197A1 (en) 2014-04-17 2017-05-25 Colorado School Of Mines Led pumped laser device and method of use
US20200412082A1 (en) * 2018-02-26 2020-12-31 Cynosure, Llc Q-switched Cavity Dumped Sub-nanosecond Laser

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
ADRIEN BARBET ET AL., OPTICA, vol. 3, 2016, pages 465
BRENDEN VILLARS ET AL., OPTICS LETTS, vol. 40, 2015, pages 3049
FUJIKAWA S ET AL: "28% ELECTRICAL-EFFICIENCY OPERATION OF A DIODE-SIDE-PUMPED ND:YAG ROD LASER", OPTICS LETTERS, OPTICAL SOCIETY OF AMERICA, US, vol. 26, no. 9, 1 May 2001 (2001-05-01), pages 602 - 604, XP001077235, ISSN: 0146-9592 *
KOZO KAMIRYO ET AL., JPN. J. APPL. PHYS., vol. 5, 1966, pages 1217

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JP2024526352A (ja) 2024-07-17
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CN115621824A (zh) 2023-01-17
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